1. Kochi Institute for Core Sample Research (KOCHII), Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-Star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), B200 Monobe, Nankoku, Kochi 783-8502, Japan
2. Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminamimachi, Higashinada-ku, Kobe 658-0022, Japan
3. Graduate School of Integrated Arts and Sciences, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520, Japan
4. Center for Advanced Marine Core Research, Kochi University, B200 Monobe, Nankoku, Kochi 783-8502, Japan
5. Marine Works Japan, Ltd., 3-54-1 Oppamahigashimachi, Yokosuka 237-0063, Japan